Materials Literature
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An investigation to determine the number of proteins comprising the keratin of the chick down feather was carried out using anion‐exchange chromatography of the carboxymethylated derivatives of reduced feather proteins, followed by examination of discrete protein fractions by polyacrylamide gel electrophoresis at pH 9…
Abstract The low‐temperature heat capacity of collagen (in the hydrated and dehydrated states) and the large entropy of collagen in the coiled state relative to the same protein in the helical state were investigated. The heat capacity for collagen in the solid state in the temperature range 4°–50° K changes proportio…
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Monoclinic unit-cell parameters for LnPO4 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy) have been redetermined from Guinier photographs, and are plotted against effective ionic radii of the lanthanides. Full powder-diffraction data are given for LaPO4 and GdPO4.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetrahalo- and (mixed-tetrahalo)cuprates of the piperazinium dication. Coordination geometry changes in some CuX42- anionsGiuseppe Marcotrigiano, Ledi Menabue, and Gian C. PellacaniCite this: Inorg. Chem. 1976, 15, 10, 2333–2336Publication Date (Print):October 1, 1976Publica…
Abstract Polyvinylamine which contained 95.6 mol% amine units was obtained when the Hofmann degradation was applied to polyacrylamide by use of a very slight excess of sodium hypochlorite and a large excess of sodium hydroxide at 0 to −15 °C for about 15 h. Polyvinylamine hydrochloride (PVAm·HCl) was isolated almost q…
For ${\mathrm{Cd}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{O}_{4}$ and ${\mathrm{Zn}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{O}_{4}$, the conduction-electron concentration has been varied over a wide range without the introduction of $B$-site impurities or defects. Analysis of the $^{57}\mathrm{Fe}$ M\"ossbauer-effect data i…
Ellipsometry studies of evaporated aluminum films anodized in 0.6 M H 3 PO 4 at constant current indicate that the anodic oxide produced is at first homogeneous with a refractive index of 1.62, as found for barrier anodic oxide of thin film and bulk Al. As the thickness increases, the optical properties change signify…
Abstract The F + charge state of the oxygen vacancy in ZnO is created by means of an electron irradiation performed at an energy lower than the energy threshold for zinc displacements. Charge state changes of this defect observed by EPR under illumination are also described.
Several approximate procedures for the calculation of the intensities of atoms elastically scattered from solids are compared with nearly exact quantum calculations from a sinusoidal hard wall potential. The quasiclassical method reproduces the qualitative features of the ’’rainbow’’ envelope of the scattered intensit…
Abstract Photoinduced free radicals in cellulose were studies by means of ESR spectroscopy. Plausible mechanisms have been suggested for each type of intermediate radical to account for the ESR spectra observed and for the product balances. Based on the principles of photochemistry of cellulose, coupled with the findi…
The thermal expansion of RCo 2 compounds (R=Gd, Tb, Dy, Ho and Er) has been measured from 4.2 K up to 700 K. All the RCo 2 compounds show an Invar-like thermal expansion anomaly below their Curie temperatures: a large positive spontaneous volume magnetostriction was found. The large magneto-volume coupling is presumab…
We investigate the existence of a glass transition for the systems of hard spheres studied in computer simulations of molecular dynamics. An empirical best-fit equation of state is established for the metastable (supercooled or supercompressed) hard sphere liquid. Configurational thermodynamic properties are calculate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of the chemisorption of nitric oxide on PdY zeolite. Evidence for a room temperature oxidative dissolution of palladium crystallitesM. Che, J. F. Dutel, P. Gallezot, and M. PrimetCite this: J. Phys. Chem. 1976, 80, 21, 2371–2381Publication Date (Print):October 1, 197…
A criterion is presented for the stability of the external shape of the crystal in crystal growth from the melt. The criterion takes cognizance of the finding that the constant cross-sectional growth of crystals by a meniscus-controlled process, such as Czochralski, floating-zone, and edge-defined film-fed growth (EFG…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical systematics of metal clusters. Crystallographic evidence for a new cubane .dblharw. chair isomerism in tetrameric triphenylphosphine silver iodide, (Ph3P)4Ag4I4Boon-Keng. Teo and Joseph C. CalabreseCite this: Inorg. Chem. 1976, 15, 10, 2474–2486Publication Dat…
Composition depth profiles of passive films on iron in a borate solution at p H 8.42 have been obtained by means of cathodic reduction combined with ellipsometry and chemical analysis. Results revealed that the compositional profile varied depending primarily on the potential and to some degree on the time of film gro…
Abstract An infrared absorbance subtraction technique has been used to “isolate” bands in the composite spectrum of semicrystalline polymers according to their crystalline or amorphous character. Amorphous and crystalline spectra for annealed, melt‐quenched, and solution‐cast poly(ethylene terephthalate) have been sep…
Appearance of satellite lines in the X-ray photoelectron emission from the 2 p -shell of the metal ion transition-metal compounds are ascribed to the increase of covalency due to the creation of an inner-core hole. For this argument a simple two-configuration model is used, which reveals a shortcoming once ab initio c…